Free tool
Pick a city and year to see every sunrise-to-sunset daylight band, plus the longest day, shortest day, equinoxes, solstices, and polar daylight counts.
This chart turns a full year of sunrise and sunset calculations into one compact daylight map. Each vertical slice is one local calendar day for the selected city. The shaded band starts at sunrise and ends at sunset, so a wider band means more usable daylight. The top of the plot is midnight, the middle is noon, and the bottom is the next midnight. Hover the SVG to inspect the exact daylight length for a date.
The solstice markers come from the longest and shortest daylight days found in the computed year, rather than fixed calendar dates. Equinox markers are chosen from the days closest to twelve hours of daylight around the March and September transition windows, with labels adjusted for the city's hemisphere. At high latitudes the sun can stay above or below the sunrise horizon all day. Those polar days are drawn as full-height daylight columns, while polar-night days are drawn as a thin baseline so the missing sunrise and sunset remain visible.